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        <a href="blam-module.html">Module&nbsp;blam</a> ::
        Class&nbsp;CameraCalibrationOperator
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class CameraCalibrationOperator</h1><p class="nomargin-top"><span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator">source&nbsp;code</a></span></p>
<pre class="base-tree">
bpy.types.Operator --+
                     |
                    <strong class="uidshort">CameraCalibrationOperator</strong>
</pre>

<hr />
<p>This operator handles estimation of focal length and camera 
  orientation from input line segments. All section numbers, equations 
  numbers etc refer to &quot;Using Vanishing Points for Camera Calibration 
  and Coarse 3D Reconstruction from a Single Image&quot; by E. Guillou, D. 
  Meneveaux, E. Maisel, K. Bouatouch.</p>

<hr />
<div class="fields">      <p><strong>See Also:</strong>
        http://www.irisa.fr/prive/kadi/Reconstruction/paper.ps.gz
      </p>
</div><!-- ==================== INSTANCE METHODS ==================== -->
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          <td><span class="summary-sig"><a href="blam.CameraCalibrationOperator-class.html#computeSecondVanishingPoint" class="summary-sig-name">computeSecondVanishingPoint</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">Fu</span>,
        <span class="summary-sig-arg">f</span>,
        <span class="summary-sig-arg">P</span>,
        <span class="summary-sig-arg">horizonDir</span>)</span><br />
      Computes the coordinates of the second vanishing point based on an 
      existing vanishing point, a focal length, the center of projection 
      and a 2D vector in the direction of the horizon.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator.computeSecondVanishingPoint">source&nbsp;code</a></span>
            
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          <td><span class="summary-sig"><a href="blam.CameraCalibrationOperator-class.html#computeFocalLength" class="summary-sig-name">computeFocalLength</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">Fu</span>,
        <span class="summary-sig-arg">Fv</span>,
        <span class="summary-sig-arg">P</span>)</span><br />
      Computes the focal length based on two vanishing points and a center 
      of projection.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator.computeFocalLength">source&nbsp;code</a></span>
            
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          <td><span class="summary-sig"><a href="blam.CameraCalibrationOperator-class.html#computeCameraRotationMatrix" class="summary-sig-name">computeCameraRotationMatrix</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">Fu</span>,
        <span class="summary-sig-arg">Fv</span>,
        <span class="summary-sig-arg">f</span>)</span><br />
      Computes the camera rotation matrix based on two vanishing points and
      a focal length</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator.computeCameraRotationMatrix">source&nbsp;code</a></span>
            
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      <span class="summary-type">&nbsp;</span>
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          <td><span class="summary-sig"><a href="blam.CameraCalibrationOperator-class.html#alignCoordinateAxes" class="summary-sig-name">alignCoordinateAxes</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">M</span>,
        <span class="summary-sig-arg">ax1</span>,
        <span class="summary-sig-arg">ax2</span>)</span><br />
      Modifies the original camera transform to make the coordinate axes 
      line up as specified.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator.alignCoordinateAxes">source&nbsp;code</a></span>
            
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          <td><span class="summary-sig"><a href="blam.CameraCalibrationOperator-class.html#gatherGreasePencilSegments" class="summary-sig-name">gatherGreasePencilSegments</a>(<span class="summary-sig-arg">self</span>)</span><br />
      Collects and returns line segments in normalized image coordinates 
      from the first two grease pencil layers.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator.gatherGreasePencilSegments">source&nbsp;code</a></span>
            
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          <td><span class="summary-sig"><a name="computeIntersectionPointForLineSegments"></a><span class="summary-sig-name">computeIntersectionPointForLineSegments</span>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">lineSet</span>)</span><br />
      Computes the intersection point in a least squares sense of a 
      collection of line segments.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator.computeIntersectionPointForLineSegments">source&nbsp;code</a></span>
            
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          <td><span class="summary-sig"><a name="relImgCoords2ImgPlaneCoords"></a><span class="summary-sig-name">relImgCoords2ImgPlaneCoords</span>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">pt</span>,
        <span class="summary-sig-arg">imageWidth</span>,
        <span class="summary-sig-arg">imageHeight</span>)</span></td>
          <td align="right" valign="top">
            <span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator.relImgCoords2ImgPlaneCoords">source&nbsp;code</a></span>
            
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          <td><span class="summary-sig"><a href="blam.CameraCalibrationOperator-class.html#execute" class="summary-sig-name">execute</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">context</span>)</span><br />
      Executes the operator.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator.execute">source&nbsp;code</a></span>
            
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<!-- ==================== CLASS VARIABLES ==================== -->
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
        <a name="bl_idname"></a><span class="summary-name">bl_idname</span> = <code title="&quot;object.estimate_focal_length&quot;">&quot;object.estimate_focal_length&quot;</code>
    </td>
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
        <a name="bl_label"></a><span class="summary-name">bl_label</span> = <code title="&quot;Calibrate active camera&quot;">&quot;Calibrate active camera&quot;</code>
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
        <a href="blam.CameraCalibrationOperator-class.html#bl_description" class="summary-name">bl_description</a> = <code title="&quot;Computes the focal length and orientation of the active camera based \
on the provided grease pencil strokes.&quot;">&quot;Computes the focal length and orientation of<code class="variable-ellipsis">...</code></code>
    </td>
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<!-- ==================== METHOD DETAILS ==================== -->
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<a name="computeSecondVanishingPoint"></a>
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  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">computeSecondVanishingPoint</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">Fu</span>,
        <span class="sig-arg">f</span>,
        <span class="sig-arg">P</span>,
        <span class="sig-arg">horizonDir</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator.computeSecondVanishingPoint">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Computes the coordinates of the second vanishing point based on an 
  existing vanishing point, a focal length, the center of projection and a 
  2D vector in the direction of the horizon. The equations here are derived
  from</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>Fu</code></strong> - the first vanishing point in normalized image coordinates.</li>
        <li><strong class="pname"><code>f</code></strong> - the relative focal length.</li>
        <li><strong class="pname"><code>P</code></strong> - the center of projection in normalized image coordinates.</li>
        <li><strong class="pname"><code>horizonDir</code></strong> - The desired horizon direction.</li>
    </ul></dd>
    <dt>Returns:</dt>
        <dd>The coordinates of the second vanishing point.</dd>
  </dl>
<div class="fields">      <p><strong>See Also:</strong>
        Section 3.2 &quot;Determining the focal length from a single 
        image&quot;.
      </p>
</div></td></tr></table>
</div>
<a name="computeFocalLength"></a>
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       cellspacing="0" width="100%" bgcolor="white">
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  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">computeFocalLength</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">Fu</span>,
        <span class="sig-arg">Fv</span>,
        <span class="sig-arg">P</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator.computeFocalLength">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Computes the focal length based on two vanishing points and a center 
  of projection.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>Fu</code></strong> - the first vanishing point in normalized image coordinates.</li>
        <li><strong class="pname"><code>Fv</code></strong> - the second vanishing point in normalized image coordinates.</li>
        <li><strong class="pname"><code>P</code></strong> - the center of projection in normalized image coordinates.</li>
    </ul></dd>
    <dt>Returns:</dt>
        <dd>The relative focal length.</dd>
  </dl>
<div class="fields">      <p><strong>See Also:</strong>
        Section 3.2 &quot;Determining the focal length from a single 
        image&quot;
      </p>
</div></td></tr></table>
</div>
<a name="computeCameraRotationMatrix"></a>
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       cellspacing="0" width="100%" bgcolor="white">
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  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">computeCameraRotationMatrix</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">Fu</span>,
        <span class="sig-arg">Fv</span>,
        <span class="sig-arg">f</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator.computeCameraRotationMatrix">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Computes the camera rotation matrix based on two vanishing points and 
  a focal length</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>Fu</code></strong> - the first vanishing point in normalized image coordinates.</li>
        <li><strong class="pname"><code>Fv</code></strong> - the second vanishing point in normalized image coordinates.</li>
        <li><strong class="pname"><code>f</code></strong> - the relative focal length.</li>
    </ul></dd>
    <dt>Returns:</dt>
        <dd>The matrix Moc</dd>
  </dl>
<div class="fields">      <p><strong>See Also:</strong>
        Section 3.3 &quot;Computing the rotation matrix&quot;.
      </p>
</div></td></tr></table>
</div>
<a name="alignCoordinateAxes"></a>
<div>
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       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">alignCoordinateAxes</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">M</span>,
        <span class="sig-arg">ax1</span>,
        <span class="sig-arg">ax2</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator.alignCoordinateAxes">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Modifies the original camera transform to make the coordinate axes 
  line up as specified.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>M</code></strong> - the original camera rotation matrix</li>
        <li><strong class="pname"><code>ax2</code></strong> - The index of the axis to align with the second layer segments.</li>
    </ul></dd>
    <dt>Returns:</dt>
        <dd>The final camera rotation matrix.</dd>
  </dl>
</td></tr></table>
</div>
<a name="gatherGreasePencilSegments"></a>
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  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">gatherGreasePencilSegments</span>(<span class="sig-arg">self</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator.gatherGreasePencilSegments">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Collects and returns line segments in normalized image coordinates 
  from the first two grease pencil layers.</p>
  <dl class="fields">
    <dt>Returns:</dt>
        <dd>A list of line segment sets. [i][j][k][l] is coordinate l of 
          point k in segment j from layer i.</dd>
  </dl>
</td></tr></table>
</div>
<a name="execute"></a>
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  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">execute</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">context</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="blam-pysrc.html#CameraCalibrationOperator.execute">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Executes the operator.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>context</code></strong> - The context in which the operator was executed.</li>
    </ul></dd>
  </dl>
</td></tr></table>
</div>
<br />
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<a name="bl_description"></a>
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  <h3 class="epydoc">bl_description</h3>
  
  <dl class="fields">
  </dl>
  <dl class="fields">
    <dt>Value:</dt>
      <dd><table><tr><td><pre class="variable">
&quot;Computes the focal length and orientation of the active camera based <span class="variable-linewrap"><img src="crarr.png" alt="\" /></span>
on the provided grease pencil strokes.&quot;
</pre></td></tr></table>
</dd>
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